Description

Disodium 4-[[2,4-Diamino-5-[(3-Sulphonatophenyl)Azo]Phenyl]Azo]-2-[[2,6-Dihydroxy-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]Benzenesulphonate is a high-purity, synthetic azo dye intermediate of significant commercial importance. This compound is valued for its ability to impart intense and stable coloration in demanding industrial applications. It is primarily sought by manufacturers in the textile, ink, and specialty coatings industries for producing high-performance pigments and dyes.

Application

• Primary Textile Dyeing: Used in the synthesis of reactive and direct dyes for coloring cotton, wool, and nylon fibers.
• Ink Formulation: Serves as a key colorant intermediate for industrial inks, including those for packaging and printing.
• Specialty Coatings: Employed in the production of pigments for automotive, industrial, and decorative paints requiring lightfastness.
• Leather Coloring: Acts as an intermediate in dyes used for leather finishing and dyeing processes.
• Paper Coloring: Utilized in the manufacture of dyes for specialty and decorative papers.
• Plastics and Polymers: Can be incorporated as a colorant intermediate for certain engineering plastics and synthetic materials.

Basic Information

Product Name	Disodium 4-[[2,4-Diamino-5-[(3-Sulphonatophenyl)Azo]Phenyl]Azo]-2-[[2,6-Dihydroxy-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]Benzenesulphonate
CAS No.	6428-27-9
Molecular Formula	C30H20N10Na2O11S2
Molecular Weight	810.71 g/mol
Synonyms	Direct Black 19 (disodium salt); C.I. 35255; Benzenesulfonic acid, 4-[[2,4-diamino-5-[(3-sulfophenyl)azo]phenyl]azo]-2-[[2,6-dihydroxy-3-[(4-nitrophenyl)azo]phenyl]azo]-, disodium salt; 6428-27-9; Direct Black G; Pontamine Black E; Azo Black; Diazol Black G
EINECS	229-218-3

Quality Control

Our Disodium 4-[[2,4-Diamino-5-[(3-Sulphonatophenyl)Azo]Phenyl]Azo]-2-[[2,6-Dihydroxy-3-[(4-Nitrophenyl)Azo]Phenyl]Azo]Benzenesulphonate is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, color strength, and performance. Certificates of Analysis (COA) detailing assay, impurity profile, and physical specifications are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product performance and handling.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Color Strength	100% ± 3% (vs. Standard)
Moisture (KF)	≤ 5.0%
Ash Content	≤ 20.0%
Water Solubility	Conforms
Heavy Metals (as Pb)	≤ 20 ppm

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.